Bitcoin is the first digital currency of the world. It is the most popular, notable and highest in market capitalization.
Initial price value of bitcoin in July 2010 was $ 0.008. In first five days, the price grew 1000%, rising from $ 0.008 to $ 0.08 per bitcoin. 
After 1 year in July 2011 its price reached $31.00. Current bitcoin price is around $2800.